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Unified Diff: src/core/SkPicturePlayback.h

Issue 377623002: Split SkPicturePlayback out of SkPictureData (Closed) Base URL: https://skia.googlesource.com/skia.git@master
Patch Set: Add virtual dtor for SkPicturePlayback Created 6 years, 5 months ago
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Index: src/core/SkPicturePlayback.h
diff --git a/src/core/SkPicturePlayback.h b/src/core/SkPicturePlayback.h
new file mode 100644
index 0000000000000000000000000000000000000000..251ad3a8568c0643e261e2a8ab7dfb9c3323f8f9
--- /dev/null
+++ b/src/core/SkPicturePlayback.h
@@ -0,0 +1,118 @@
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkPicturePlayback_DEFINED
+#define SkPicturePlayback_DEFINED
+
+#include "SkTypes.h"
+
+class SkBitmap;
+class SkCanvas;
+class SkDrawPictureCallback;
+class SkPaint;
+class SkPictureData;
+
+class SkPicturePlayback : SkNoncopyable {
+public:
+ SkPicturePlayback(const SkPicture* picture)
+ : fPictureData(picture->fData.get())
+ , fCurOffset(0)
+ , fUseBBH(true)
+ , fStart(0)
+ , fStop(0)
+ , fReplacements(NULL) {
+ }
+ virtual ~SkPicturePlayback() { }
+
+ void draw(SkCanvas* canvas, SkDrawPictureCallback*);
+
+ // Return the ID of the operation currently being executed when playing
+ // back. 0 indicates no call is active.
+ size_t curOpID() const { return fCurOffset; }
+ void resetOpID() { fCurOffset = 0; }
+
+ void setUseBBH(bool useBBH) { fUseBBH = useBBH; }
+
+ // Limit the opcode playback to be between the offsets 'start' and 'stop'.
+ // The opcode at 'start' should be a saveLayer while the opcode at
+ // 'stop' should be a restore. Neither of those commands will be issued.
+ // Set both start & stop to 0 to disable draw limiting
+ // Draw limiting cannot be enabled at the same time as draw replacing
+ void setDrawLimits(size_t start, size_t stop) {
+ SkASSERT(NULL == fReplacements);
+ fStart = start;
+ fStop = stop;
+ }
+
+ // PlaybackReplacements collects op ranges that can be replaced with
+ // a single drawBitmap call (using a precomputed bitmap).
+ class PlaybackReplacements {
+ public:
+ // All the operations between fStart and fStop (inclusive) will be replaced with
+ // a single drawBitmap call using fPos, fBM and fPaint.
+ // fPaint will be NULL if the picture's paint wasn't copyable
+ struct ReplacementInfo {
+ size_t fStart;
+ size_t fStop;
+ SkIPoint fPos;
+ SkBitmap* fBM; // fBM is allocated so ReplacementInfo can remain POD
+ const SkPaint* fPaint; // Note: this object doesn't own the paint
+
+ SkIRect fSrcRect;
+ };
+
+ ~PlaybackReplacements() { this->freeAll(); }
+
+ // Add a new replacement range. The replacement ranges should be
+ // sorted in increasing order and non-overlapping (esp. no nested
+ // saveLayers).
+ ReplacementInfo* push();
+
+ private:
+ friend class SkPicturePlayback; // for access to lookupByStart
+
+ // look up a replacement range by its start offset
+ ReplacementInfo* lookupByStart(size_t start);
+
+ void freeAll();
+
+#ifdef SK_DEBUG
+ void validate() const;
+#endif
+
+ SkTDArray<ReplacementInfo> fReplacements;
+ };
+
+ // Replace all the draw ops in the replacement ranges in 'replacements' with
+ // the associated drawBitmap call
+ // Draw replacing cannot be enabled at the same time as draw limiting
+ void setReplacements(PlaybackReplacements* replacements) {
+ SkASSERT(fStart == 0 && fStop == 0);
+ fReplacements = replacements;
+ }
+
+protected:
+ const SkPictureData* fPictureData;
+
+ // The offset of the current operation when within the draw method
+ size_t fCurOffset;
+
+ bool fUseBBH;
+ size_t fStart;
+ size_t fStop;
+ PlaybackReplacements* fReplacements;
+
+#ifdef SK_DEVELOPER
+ virtual bool preDraw(int opIndex, int type) { return false; }
+ virtual void postDraw(int opIndex) { }
+#endif
+
+private:
+ typedef SkNoncopyable INHERITED;
+};
+
+#endif
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